connecting arduino to shelly1

is there a way to control the shelly1 switch directly from arduino uno without wifi or external shields when it is connected to mains voltage. some source said it is unsafe. and most other materials i've googled require something else like ftdi.

What's a shelly1 switch?

it's a wifi switch for mains voltage. it has TX/RX pins. i've seen videos that use some serial breakout board to connect to it. i'd like to just operate it from the arduino without having to use wifi.

Post a link to the datasheet for the shelly1 switch